HARAHAP, Mariah.
 Efforts to Improve Understanding of the Main Material of Morals Through the Problem Based Learning Model for Class VIII Students of SMP Negeri 2 Tambusai.
<strong>Indonesian Journal of Basic Education</strong>, [S.l.], v. 7, n. 3, p. 209 - 214, apr. 2025.
ISSN 2615-8523.
Available at: &lt;<a href="https://e-jurnal.stkiprokania.ac.id/index.php/IJOBE/article/view/1122" target="_new">https://e-jurnal.stkiprokania.ac.id/index.php/IJOBE/article/view/1122</a>&gt;. Date accessed: 08 may 2026.
doi: <a href="https://doi.org/10.37728/ijobe.v7i3.1122">https://doi.org/10.37728/ijobe.v7i3.1122</a>.